<template>
  <view class="uni-load-more uiwu-ios" @click="onClick">
    <!-- #ifdef APP-NVUE -->
    <loading-indicator v-if="!webviewHide && status === 'loading' && showIcon" :style="{color: color,width:iconSize+'px',height:iconSize+'px'}" :animating="true" class="uni-load-more__img uni-load-more__img--nvue" />
    <!-- #endif -->
    <!-- #ifdef H5 -->
    <svg
      v-if="!webviewHide && (iconType==='circle' || iconType==='auto' && platform === 'android') && status === 'loading' && showIcon"
      width="24"
      height="24"
      viewBox="25 25 50 50"
      :style="{width:iconSize+'px',height:iconSize+'px'}"
      class="uni-load-more__img uni-load-more__img--android-H5"
    >
      <circle
        cx="50"
        cy="50"
        r="20"
        fill="none"
        :style="{color:color}"
        :stroke-width="3"
      />
    </svg>
    <!-- #endif -->
    <!-- #ifndef APP-NVUE || H5 -->
    <view
      v-if="!webviewHide && (iconType==='circle' || iconType==='auto' && platform === 'android') && status === 'loading' && showIcon"
      :style="{width:iconSize+'px',height:iconSize+'px'}"
      class="uni-load-more__img uni-load-more__img--android-MP"
    >
      <view :style="{borderTopColor:color,borderTopWidth:iconSize/12}" />
      <view :style="{borderTopColor:color,borderTopWidth:iconSize/12}" />
      <view :style="{borderTopColor:color,borderTopWidth:iconSize/12}" />
    </view>
    <!-- #endif -->
    <!-- #ifndef APP-NVUE -->
    <view v-else-if="!webviewHide && status === 'loading' && showIcon" :style="{width:iconSize+'px',height:iconSize+'px'}" class="uni-load-more__img uni-load-more__img--ios-H5">
      <image
        src=""
        mode="widthFix"
      />
    </view>
    <!-- #endif -->
    <text class="uni-load-more__text" :style="{color: color}">{{ status === 'more' ? contentText.contentdown : status === 'loading' ? contentText.contentrefresh : contentText.contentnomore }}</text>
  </view>
</template>

<script>
const platform = uni.getSystemInfoSync().platform

/**
	 * LoadMore 加载更多
	 * @description 用于列表中，做滚动加载使用，展示 loading 的各种状态
	 * @property {String} status = [more|loading|noMore] loading 的状态
	 * 	@value more loading前
	 * 	@value loading loading中
	 * 	@value noMore 没有更多了
	 * @property {Number} iconSize 指定图标大小
	 * @property {Boolean} iconSize = [true|false] 是否显示 loading 图标
	 * @property {String} iconType = [snow|circle|auto] 指定图标样式
	 * 	@value snow ios雪花加载样式
	 * 	@value circle 安卓唤醒加载样式
	 * 	@value auto 根据平台自动选择加载样式
	 * @property {String} color 图标和文字颜色
	 * @property {Object} contentText 各状态文字说明，值为：{contentdown: "上拉显示更多",contentrefresh: "正在加载...",contentnomore: "没有更多数据了"}
	 * @event {Function} clickLoadMore 点击加载更多时触发
	 */
export default {
  name: 'UiwuLoadMore',
  props: {
    status: {
      // 上拉的状态：more-loading前；loading-loading中；noMore-没有更多了
      type: String,
      default: 'more'
    },
    showIcon: {
      type: Boolean,
      default: true
    },
    iconType: {
      type: String,
      default: 'auto'
    },
    iconSize: {
      type: Number,
      default: 24
    },
    color: {
      type: String,
      default: '#777777'
    },
    contentText: {
      type: Object,
      default () {
        return {
          contentdown: '上拉显示更多',
          contentrefresh: '正在加载...',
          contentnomore: '没有更多数据了'
        }
      }
    }
  },
  data() {
    return {
      webviewHide: false,
      platform: platform
    }
  },
  // #ifndef APP-NVUE
  computed: {
    iconSnowWidth() {
      return (Math.floor(this.iconSize / 24) || 1) * 2
    }
  },
  methods: {
    onClick() {
      this.$emit('clickLoadMore', {
        detail: {
          status: this.status
        }
      })
    }
  },
  // #endif
  mounted() {
    // #ifdef APP-PLUS
    const pages = getCurrentPages();
    const page = pages[pages.length - 1];
    const currentWebview = page.$getAppWebview();
    currentWebview.addEventListener('hide', () => {
      this.webviewHide = true
    })
    currentWebview.addEventListener('show', () => {
      this.webviewHide = false
    })
    // #endif
  }
}
</script>

<style lang="scss" scoped>
  .uni-load-more {
    /* #ifndef APP-NVUE */
    display: flex;
	box-sizing: content-box;
    /* #endif */
    flex-direction: row;
    height: 40px;
    align-items: center;
    justify-content: center;
  }

  .uni-load-more__text {
    font-size: 15px;
  }

  .uni-load-more__img {
    width: 24px;
    height: 24px;
    margin-right: 8px;
  }

  .uni-load-more__img--nvue {
    color: #666;
  }

  .uni-load-more__img--android,
  .uni-load-more__img--ios {
    width: 24px;
    height: 24px;
    transform: rotate(0deg);
  }

  /* #ifndef APP-NVUE */
  .uni-load-more__img--android {
    animation: loading-ios 1s 0s linear infinite;
  }

  @keyframes loading-android {
    0% {
      transform: rotate(0deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  .uni-load-more__img--ios-H5 {
    position: relative;
    animation: loading-ios-H5 1s 0s step-end infinite;
  }

  .uni-load-more__img--ios-H5 > image {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
  }

  @keyframes loading-ios-H5 {
    0% {
      transform: rotate(0deg);
    }

    8% {
      transform: rotate(30deg);
    }

    16% {
      transform: rotate(60deg);
    }

    24% {
      transform: rotate(90deg);
    }

    32% {
      transform: rotate(120deg);
    }

    40% {
      transform: rotate(150deg);
    }

    48% {
      transform: rotate(180deg);
    }

    56% {
      transform: rotate(210deg);
    }

    64% {
      transform: rotate(240deg);
    }

    73% {
      transform: rotate(270deg);
    }

    82% {
      transform: rotate(300deg);
    }

    91% {
      transform: rotate(330deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  /* #endif */

  /* #ifdef H5 */
  .uni-load-more__img--android-H5 {
    animation: loading-android-H5-rotate 2s linear infinite;
    transform-origin: center center;
  }

  .uni-load-more__img--android-H5 > circle {
    display: inline-block;
    animation: loading-android-H5-dash 1.5s ease-in-out infinite;
    stroke: currentcolor;
    stroke-linecap: round;
  }

  @keyframes loading-android-H5-rotate {
    0% {
      transform: rotate(0deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  @keyframes loading-android-H5-dash {
    0% {
      stroke-dasharray: 1, 200;
      stroke-dashoffset: 0;
    }

    50% {
      stroke-dasharray: 90, 150;
      stroke-dashoffset: -40;
    }

    100% {
      stroke-dasharray: 90, 150;
      stroke-dashoffset: -120;
    }
  }

  /* #endif */

  /* #ifndef APP-NVUE || H5 */
  .uni-load-more__img--android-MP {
    position: relative;
    width: 24px;
    height: 24px;
    transform: rotate(0deg);
    animation: loading-ios 1s 0s ease infinite;
  }

  .uni-load-more__img--android-MP > view {
    position: absolute;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: solid 2px transparent;
    border-top: solid 2px #777;
    transform-origin: center;
  }

  .uni-load-more__img--android-MP > view:nth-child(1) {
    animation: loading-android-MP-1 1s 0s linear infinite;
  }

  .uni-load-more__img--android-MP > view:nth-child(2) {
    animation: loading-android-MP-2 1s 0s linear infinite;
  }

  .uni-load-more__img--android-MP > view:nth-child(3) {
    animation: loading-android-MP-3 1s 0s linear infinite;
  }

  @keyframes loading-android {
    0% {
      transform: rotate(0deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  @keyframes loading-android-MP-1 {
    0% {
      transform: rotate(0deg);
    }

    50% {
      transform: rotate(90deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  @keyframes loading-android-MP-2 {
    0% {
      transform: rotate(0deg);
    }

    50% {
      transform: rotate(180deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  @keyframes loading-android-MP-3 {
    0% {
      transform: rotate(0deg);
    }

    50% {
      transform: rotate(270deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  /* #endif */
</style>
